.banner img {
    width: 100%;
}

.aboutus {
    width: 1200px;
    height: 500px;
    margin: 50px auto;
    text-align: center;
}

.aboutus h3 {
    font-size: 28px;
    color: #333;
    position: relative;
    padding-bottom: 20px;
    margin-bottom: 50px;
    font-weight: normal;
}

.aboutus h3:after {
    content: '';
    display: inline-block;
    width: 60px;
    height: 2px;
    background-color: #ff0;
    position: absolute;
    bottom: 0;
    left: 48%;
}

.aboutus .content {
    display: flex;
    flex-wrap: wrap;
    height: 300px;
}

.aboutus .content .part {
    width: 45%;
    height: 50px;
    display: flex;
    justify-content: center;
    align-items: center;
}


.aboutus .content .part .item {
    display: inline-block;
    width: 70px;
    height: 70px;
    margin-right: 20px;
    background: url(../image/home_icon1.png) no-repeat center center/450px 700px;
}

.aboutus .content .tel .item {
    background-position: -18px -607px;
}

.aboutus .content .qq .item {
    background-position: -275px -607px;
}

.aboutus .content .email .item {
    background-position: -105px -607px;
    margin-left: 76px;
}

.aboutus .content .work-time .item {
    background-position: -363px -607px;
    margin-left: 110px;
}

.aboutus .content .part p {
    color: #666;
    font-size: 22px;
}